Bodhicaryavatara can use in some parts more explanation but is a source of wealth for inspiration for so called advanced one as beginner.

May all beings have happiness and the cause of happiness.
May they be free of suffering and the cause of suffering.
May they never be disassociated from the supreme happiness which is without suffering.
May they remain in the boundless equanimity, free from both attachment to close ones and rejection of others.